Abstract：
:Permeable reactive barriers are commonly used to treat contaminant plumes in the saturated zone. However, no known applications of horizontal permeable reactive barriers (HPRBs) exist for oxidizing volatile organic compounds (VOCs) in the unsaturated zone. In this study, laboratory column experiments were carried out to investigate the ability of a HPRB containing solid potassium permanganate, to oxidize the vapors of trichloroethylene (TCE), toluene, and ethanol migrating upward from a contaminated saturated zone. Results revealed that an increase in initial water saturation and HPRB thickness strongly affected the removal efficiency of the HPRB. Installing the HPRB relatively close to the water table was more effective due to the high background water content and enhanced diffusion of protons and/or hydroxides away from the HPRB. Inserting the HPRB far above the water table caused rapid changes in pH within the HPRB, leading to lower oxidation rates. The pH effects were included in a reactive transport model, which successfully simulated the TCE and toluene experimental observations. Simulations for ethanol were not affected by pH due to condensation of water during ethanol oxidation, which caused some dilution in the HRPB.
journal_name
J Environ Managejournal_title
Journal of environmental managementauthors
Mahmoodlu MG,Hassanizadeh SM,Hartog N,Raoof A,van Genuchten MTdoi
10.1016/j.jenvman.2015.08.025subject
Has Abstractpub_date
2015-11-01 00:00:00pages
204-13eissn
0301-4797issn
1095-8630pii
S0301-4797(15)30229-2journal_volume
163pub_type
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